Rhonda Pisanello The material on the wall looks to me like Trenton Black marble tile. We just put this tile in our kitchen, around our fireplace and on our knoll post at the bottom of the stairs. It looks just like this except ours are 12 inch square tiles. It is a stunningly beautiful tile. I believe it is Olympia Tile that supplies this product. http://www.olympiatile.com/products/natural_stone/marble/4.html but I think it has since been discontinued in the large size. There is also this tile which is very similar and available in a larger size - Grigio Billiemi Honed, which is also on their website.
This transitional space makes great use not only of green and black but of great textural details as well. The textures of the wall of stone, the chandelier and the green table accessories all combine to make a clean and sleek look.